| # Copyright (c) 2012-2014, 2017-2018 ARM Limited |
| # All rights reserved. |
| # |
| # The license below extends only to copyright in the software and shall |
| # not be construed as granting a license to any other intellectual |
| # property including but not limited to intellectual property relating |
| # to a hardware implementation of the functionality of the software |
| # licensed hereunder. You may use the software subject to the license |
| # terms below provided that you ensure that this notice is replicated |
| # unmodified and in its entirety in all distributions of the software, |
| # modified or unmodified, in source code or in binary form. |
| # |
| # Copyright (c) 2007 The Regents of The University of Michigan |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are |
| # met: redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer; |
| # redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution; |
| # neither the name of the copyright holders nor the names of its |
| # contributors may be used to endorse or promote products derived from |
| # this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| from m5.defines import buildEnv |
| from m5.params import * |
| from m5.proxy import * |
| from m5.SimObject import SimObject |
| from m5.objects.BaseCPU import BaseCPU |
| from m5.objects.DummyChecker import DummyChecker |
| from m5.objects.BranchPredictor import * |
| from m5.objects.TimingExpr import TimingExpr |
| |
| from m5.objects.FuncUnit import OpClass |
| |
| class MinorOpClass(SimObject): |
| """Boxing of OpClass to get around build problems and provide a hook for |
| future additions to OpClass checks""" |
| |
| type = 'MinorOpClass' |
| cxx_header = "cpu/minor/func_unit.hh" |
| cxx_class = 'gem5::MinorOpClass' |
| |
| opClass = Param.OpClass("op class to match") |
| |
| class MinorOpClassSet(SimObject): |
| """A set of matchable op classes""" |
| |
| type = 'MinorOpClassSet' |
| cxx_header = "cpu/minor/func_unit.hh" |
| cxx_class = 'gem5::MinorOpClassSet' |
| |
| opClasses = VectorParam.MinorOpClass([], "op classes to be matched." |
| " An empty list means any class") |
| |
| class MinorFUTiming(SimObject): |
| type = 'MinorFUTiming' |
| cxx_header = "cpu/minor/func_unit.hh" |
| cxx_class = 'gem5::MinorFUTiming' |
| |
| mask = Param.UInt64(0, "mask for testing ExtMachInst") |
| match = Param.UInt64(0, "match value for testing ExtMachInst:" |
| " (ext_mach_inst & mask) == match") |
| suppress = Param.Bool(False, "if true, this inst. is not executed by" |
| " this FU") |
| extraCommitLat = Param.Cycles(0, "extra cycles to stall commit for" |
| " this inst.") |
| extraCommitLatExpr = Param.TimingExpr(NULL, "extra cycles as a" |
| " run-time evaluated expression") |
| extraAssumedLat = Param.Cycles(0, "extra cycles to add to scoreboard" |
| " retire time for this insts dest registers once it leaves the" |
| " functional unit. For mem refs, if this is 0, the result's time" |
| " is marked as unpredictable and no forwarding can take place.") |
| srcRegsRelativeLats = VectorParam.Cycles("the maximum number of cycles" |
| " after inst. issue that each src reg can be available for this" |
| " inst. to issue") |
| opClasses = Param.MinorOpClassSet(MinorOpClassSet(), |
| "op classes to be considered for this decode. An empty set means any" |
| " class") |
| description = Param.String('', "description string of the decoding/inst." |
| " class") |
| |
| def minorMakeOpClassSet(op_classes): |
| """Make a MinorOpClassSet from a list of OpClass enum value strings""" |
| def boxOpClass(op_class): |
| return MinorOpClass(opClass=op_class) |
| |
| return MinorOpClassSet(opClasses=[ boxOpClass(o) for o in op_classes ]) |
| |
| class MinorFU(SimObject): |
| type = 'MinorFU' |
| cxx_header = "cpu/minor/func_unit.hh" |
| cxx_class = 'gem5::MinorFU' |
| |
| opClasses = Param.MinorOpClassSet(MinorOpClassSet(), "type of operations" |
| " allowed on this functional unit") |
| opLat = Param.Cycles(1, "latency in cycles") |
| issueLat = Param.Cycles(1, "cycles until another instruction can be" |
| " issued") |
| timings = VectorParam.MinorFUTiming([], "extra decoding rules") |
| |
| cantForwardFromFUIndices = VectorParam.Unsigned([], |
| "list of FU indices from which this FU can't receive and early" |
| " (forwarded) result") |
| |
| class MinorFUPool(SimObject): |
| type = 'MinorFUPool' |
| cxx_header = "cpu/minor/func_unit.hh" |
| cxx_class = 'gem5::MinorFUPool' |
| |
| funcUnits = VectorParam.MinorFU("functional units") |
| |
| class MinorDefaultIntFU(MinorFU): |
| opClasses = minorMakeOpClassSet(['IntAlu']) |
| timings = [MinorFUTiming(description="Int", |
| srcRegsRelativeLats=[2])] |
| opLat = 3 |
| |
| class MinorDefaultIntMulFU(MinorFU): |
| opClasses = minorMakeOpClassSet(['IntMult']) |
| timings = [MinorFUTiming(description='Mul', |
| srcRegsRelativeLats=[0])] |
| opLat = 3 |
| |
| class MinorDefaultIntDivFU(MinorFU): |
| opClasses = minorMakeOpClassSet(['IntDiv']) |
| issueLat = 9 |
| opLat = 9 |
| |
| class MinorDefaultFloatSimdFU(MinorFU): |
| opClasses = minorMakeOpClassSet([ |
| 'FloatAdd', 'FloatCmp', 'FloatCvt', 'FloatMisc', 'FloatMult', |
| 'FloatMultAcc', 'FloatDiv', 'FloatSqrt', |
| 'SimdAdd', 'SimdAddAcc', 'SimdAlu', 'SimdCmp', 'SimdCvt', |
| 'SimdMisc', 'SimdMult', 'SimdMultAcc', 'SimdShift', 'SimdShiftAcc', |
| 'SimdDiv', 'SimdSqrt', 'SimdFloatAdd', 'SimdFloatAlu', 'SimdFloatCmp', |
| 'SimdFloatCvt', 'SimdFloatDiv', 'SimdFloatMisc', 'SimdFloatMult', |
| 'SimdFloatMultAcc', 'SimdFloatSqrt', 'SimdReduceAdd', 'SimdReduceAlu', |
| 'SimdReduceCmp', 'SimdFloatReduceAdd', 'SimdFloatReduceCmp', |
| 'SimdAes', 'SimdAesMix', |
| 'SimdSha1Hash', 'SimdSha1Hash2', 'SimdSha256Hash', |
| 'SimdSha256Hash2', 'SimdShaSigma2', 'SimdShaSigma3']) |
| |
| timings = [MinorFUTiming(description='FloatSimd', |
| srcRegsRelativeLats=[2])] |
| opLat = 6 |
| |
| class MinorDefaultPredFU(MinorFU): |
| opClasses = minorMakeOpClassSet(['SimdPredAlu']) |
| timings = [MinorFUTiming(description="Pred", |
| srcRegsRelativeLats=[2])] |
| opLat = 3 |
| |
| class MinorDefaultMemFU(MinorFU): |
| opClasses = minorMakeOpClassSet(['MemRead', 'MemWrite', 'FloatMemRead', |
| 'FloatMemWrite']) |
| timings = [MinorFUTiming(description='Mem', |
| srcRegsRelativeLats=[1], extraAssumedLat=2)] |
| opLat = 1 |
| |
| class MinorDefaultMiscFU(MinorFU): |
| opClasses = minorMakeOpClassSet(['IprAccess', 'InstPrefetch']) |
| opLat = 1 |
| |
| class MinorDefaultFUPool(MinorFUPool): |
| funcUnits = [MinorDefaultIntFU(), MinorDefaultIntFU(), |
| MinorDefaultIntMulFU(), MinorDefaultIntDivFU(), |
| MinorDefaultFloatSimdFU(), MinorDefaultPredFU(), |
| MinorDefaultMemFU(), MinorDefaultMiscFU()] |
| |
| class ThreadPolicy(Enum): vals = ['SingleThreaded', 'RoundRobin', 'Random'] |
| |
| class MinorCPU(BaseCPU): |
| type = 'MinorCPU' |
| cxx_header = "cpu/minor/cpu.hh" |
| cxx_class = 'gem5::MinorCPU' |
| |
| @classmethod |
| def memory_mode(cls): |
| return 'timing' |
| |
| @classmethod |
| def require_caches(cls): |
| return True |
| |
| @classmethod |
| def support_take_over(cls): |
| return True |
| |
| threadPolicy = Param.ThreadPolicy('RoundRobin', |
| "Thread scheduling policy") |
| fetch1FetchLimit = Param.Unsigned(1, |
| "Number of line fetches allowable in flight at once") |
| fetch1LineSnapWidth = Param.Unsigned(0, |
| "Fetch1 'line' fetch snap size in bytes" |
| " (0 means use system cache line size)") |
| fetch1LineWidth = Param.Unsigned(0, |
| "Fetch1 maximum fetch size in bytes (0 means use system cache" |
| " line size)") |
| fetch1ToFetch2ForwardDelay = Param.Cycles(1, |
| "Forward cycle delay from Fetch1 to Fetch2 (1 means next cycle)") |
| fetch1ToFetch2BackwardDelay = Param.Cycles(1, |
| "Backward cycle delay from Fetch2 to Fetch1 for branch prediction" |
| " signalling (0 means in the same cycle, 1 mean the next cycle)") |
| |
| fetch2InputBufferSize = Param.Unsigned(2, |
| "Size of input buffer to Fetch2 in cycles-worth of insts.") |
| fetch2ToDecodeForwardDelay = Param.Cycles(1, |
| "Forward cycle delay from Fetch2 to Decode (1 means next cycle)") |
| fetch2CycleInput = Param.Bool(True, |
| "Allow Fetch2 to cross input lines to generate full output each" |
| " cycle") |
| |
| decodeInputBufferSize = Param.Unsigned(3, |
| "Size of input buffer to Decode in cycles-worth of insts.") |
| decodeToExecuteForwardDelay = Param.Cycles(1, |
| "Forward cycle delay from Decode to Execute (1 means next cycle)") |
| decodeInputWidth = Param.Unsigned(2, |
| "Width (in instructions) of input to Decode (and implicitly" |
| " Decode's own width)") |
| decodeCycleInput = Param.Bool(True, |
| "Allow Decode to pack instructions from more than one input cycle" |
| " to fill its output each cycle") |
| |
| executeInputWidth = Param.Unsigned(2, |
| "Width (in instructions) of input to Execute") |
| executeCycleInput = Param.Bool(True, |
| "Allow Execute to use instructions from more than one input cycle" |
| " each cycle") |
| executeIssueLimit = Param.Unsigned(2, |
| "Number of issuable instructions in Execute each cycle") |
| executeMemoryIssueLimit = Param.Unsigned(1, |
| "Number of issuable memory instructions in Execute each cycle") |
| executeCommitLimit = Param.Unsigned(2, |
| "Number of committable instructions in Execute each cycle") |
| executeMemoryCommitLimit = Param.Unsigned(1, |
| "Number of committable memory references in Execute each cycle") |
| executeInputBufferSize = Param.Unsigned(7, |
| "Size of input buffer to Execute in cycles-worth of insts.") |
| executeMemoryWidth = Param.Unsigned(0, |
| "Width (and snap) in bytes of the data memory interface. (0 mean use" |
| " the system cacheLineSize)") |
| executeMaxAccessesInMemory = Param.Unsigned(2, |
| "Maximum number of concurrent accesses allowed to the memory system" |
| " from the dcache port") |
| executeLSQMaxStoreBufferStoresPerCycle = Param.Unsigned(2, |
| "Maximum number of stores that the store buffer can issue per cycle") |
| executeLSQRequestsQueueSize = Param.Unsigned(1, |
| "Size of LSQ requests queue (address translation queue)") |
| executeLSQTransfersQueueSize = Param.Unsigned(2, |
| "Size of LSQ transfers queue (memory transaction queue)") |
| executeLSQStoreBufferSize = Param.Unsigned(5, |
| "Size of LSQ store buffer") |
| executeBranchDelay = Param.Cycles(1, |
| "Delay from Execute deciding to branch and Fetch1 reacting" |
| " (1 means next cycle)") |
| |
| executeFuncUnits = Param.MinorFUPool(MinorDefaultFUPool(), |
| "FUlines for this processor") |
| |
| executeSetTraceTimeOnCommit = Param.Bool(True, |
| "Set inst. trace times to be commit times") |
| executeSetTraceTimeOnIssue = Param.Bool(False, |
| "Set inst. trace times to be issue times") |
| |
| executeAllowEarlyMemoryIssue = Param.Bool(True, |
| "Allow mem refs to be issued to the LSQ before reaching the head of" |
| " the in flight insts queue") |
| |
| enableIdling = Param.Bool(True, |
| "Enable cycle skipping when the processor is idle\n"); |
| |
| branchPred = Param.BranchPredictor(TournamentBP( |
| numThreads = Parent.numThreads), "Branch Predictor") |
| |
| def addCheckerCpu(self): |
| print("Checker not yet supported by MinorCPU") |
| exit(1) |
